| 1918 | October 23 | Fiume's Croat dominated Austro-Hungarian garrison mutinies. |
| October 27 | Fiume comes under control of the South Slavian Committee of Agram (German:Zagreb). |
| November 4 | The Italian cruiser RN Emanuele Filiberto enters Fiume harbor. The Italian National Council takes control of the city. |
| November 17 | French forces install an Inter-Allied governing committee in Fiume. |
| | The French destroyer Audace lands British and American troops in Fiume. |
| 1919 | February 7 | Italy presents the Paris Peace Conference with a claim to Fiume. |
| February 11 | Yugoslavia asks President Wilson to arbitrate the Fiume dispute. |
| February 18 | Italy refuses to accept mediation of the Fiume dispute and declares that the Croats and Slovenes should be treated as enemy peoples. |
| March 21 | Italy threatens to withdraw from the Paris Peace Conference unless it is given Fiume. |
| April 14 | President Wilson meets privately with the Italian delegation. Wilson insists that Fiume must go to Yugoslavia. |
| April 26 | Premier Orlando and the Italian delegation leave Paris to protest President Wilson's position on the Fiume question. |
| May 7 | Premier Orlando agrees to return to the Paris Conference after receiving a vote of confidence from the Italian parliament and support from public demonstrations. |
| June 28 | The Treaty of Versailles is concluded without addressing the Fiume dispute. |
| September 12 | Blackshirted Arditi legionnaires led by poet Gabriel D'Annunzio seize Fiume. |
| | D'Annunzio declares the Reggenza Italiana del Carnaro (Italian Regency of Carnaro). |
| September 20 | D'Annunzio assumes full power over the city and begins issuing decrees as "Commander of the City of Fiume". |
| October 16 | Italian troops blockade Fiume. |
| | D'Annunzio declares Fiume a "fortress under seige", imposes martial law and threatens to execute opponents of the Italian Fiume cause. |
| October 26 | Fiume votes in favor of annexation to Italy 6999 to 156. Arditi thugs prevent pro-Yugoslav voters from participating in the plebiscite. |
| 1920 | June 4 | The Treaty of Trianon formally ends Hungarian sovereignty over Fiume. |
| September 8 | D'Annunzio collaborates with anarcho-syndicalist Alceste de Ambris in promulgating the Carta del Carnaro, a constitution establishing Fiume as a "Corporate State". |
| November 12 | Italy and Yugoslavia sign the Treaty of Rapallo. Fiume is recognized as an independent "Free City". |
| November 13 | The Free City of Fiume seizes the islands of Arbe and Veglia in the Gulf of Carnaro. |
| December 3 | D'Annunzio declares war on Italy. |
| December 24 | Italian Premier Giovanni Giolitti dispatches an expeditionary corps under General Enrico Couiglia to oust D'Annunzio's regime. |
| December 28 | The Italian battleship Andrea Doria to shells the municipal palace. D'Annunzio abdicates and flees Fiume. Italy proclaims the Stato Libero di Fiume (Free State of Fiume). Riccardo Zanella forms a provisional government. |
| 1921 | January 5 | Fiume withdraws from Arbe and Veglia. |
| April 24 | Fiumans vote in favor of a proposal by Fiume President Riccardo Zanella and Italian Foreign Minister Count Carlo Sforza to create the Free State of Fiume-Rijeka and place the port under control of an Italo-Fiuman-Yugoslav consortium. |
| October 6 | Zanella's government wins the first elections for the Free State assembly. |
| 1922 | March 3 | Italian fascist leader Giuriati deposes Zanella. Fiume retains its Independence. Zanella forms a government in exile in Yugoslavia. |
| 1924 | January 27 | The Treaty of Rome cedes Fiume to Italy and suburban Susak to Yugoslavia. |
| February 22 | Fiume is incorporated into the Kingdom of Italy. |
| March 16 | King Victor Emanuel III of Italy arrives in Fiume aboard the cruiser Brindisi. |
| 1937 | | Gabriel D'Annunzio is appointed President of the Royal Italian Academy. |
| 1938 | March 1 | Gabriel D'Annunzio dies of a cerebral hemorrhage at his exile villa in Italy. |
| 1943 | September 8 | German troops occupy Fiume after Italy signs an armistice with the Allies. |
| 1945 | May 3 | Yugoslav partisans liberate Fiume from German forces. |
| 1947 | February 10 | Treaty of Paris, Italy cedes Fiume to Yugoslavia. Fiume becomes the Croatian city of Rijeka. |
